BAC Calculator – Blood Alcohol Content Estimate
Estimate blood alcohol content based on drinks, weight, sex, and time elapsed.
❤️ Health📐
Weight (lbs)
Standard drinks consumed
Hours since first drink
Sex
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| BAC Calculator – Blood Alcohol Content Estimate | result |
Step-by-Step Examples
Example 1
160lb male, 3 drinks, 2hrs
- BAC: ~0.064% — below 0.08% but impaired, do not drive
✓ 0.064%
Example 2
130lb female, 2 drinks, 1hr
- BAC: ~0.066% — close to legal limit!
✓ 0.066%
Example 3
5 drinks, 3hrs
- Likely over 0.08% limit — arrange a ride
✓ Likely over limit
Real-World Applications
Adults
Know your alcohol level.
Bartenders
Estimate customer impairment.
Athletes
Know alcohol effects on performance.
Educators
Teach responsible drinking.
Common Mistakes to Avoid
⚠️
This is an estimate
Actual BAC varies with food, metabolism, medications.
⚠️
Feeling sober is not safe
Impairment starts well below 0.08%.
Frequently Asked Questions
US legal limit? ▾
0.08% for drivers 21+. Commercial: 0.04%. Under 21: 0.00-0.02%.
How long to sober up? ▾
~0.015% per hour. Nothing speeds this up.
Standard drink? ▾
1.5oz spirits, 5oz wine, or 12oz beer = one standard drink.